Checking In and Checking Out

If several people are collaborating on a site, it might be helpful to know who put which file where, and when they did it. (If there are only one or two of you, you should already know the answer.)

Checking out a file locks it on the remote server and allows you to edit it locally, while a flag appears on it (a red checkmark) that says to others, "Can't Touch This." Checking in a file unlocks it on the remote server, but makes it read-only on your local site so that you don't accidentally edit a file that is not checked out.